Search found 806 matches
- Thu Oct 01, 2009 9:39 pm
- Forum: Simbody: SimTK multibody dynamics API
- Topic: Runge Kutta Merson t1>t0 assert
- Replies: 4
- Views: 529
RE: Runge Kutta Merson t1>t0 assert
er, that's "two" points, not "to" points
- Thu Oct 01, 2009 9:35 pm
- Forum: Simbody: SimTK multibody dynamics API
- Topic: Runge Kutta Merson t1>t0 assert
- Replies: 4
- Views: 529
RE: Runge Kutta Merson t1>t0 assert
<t>Here is the newly checked-in documentation for the ConstantAngle API:<br/> /**<br/> * This constraint consists of a single constraint equation that enforces that<br/> * a unit vector v1 fixed to one body (the "base body") must maintain a fixed <br/> * angle theta with respect to a unit vector v2 ...
- Thu Oct 01, 2009 9:02 pm
- Forum: Simbody: SimTK multibody dynamics API
- Topic: Runge Kutta Merson t1>t0 assert
- Replies: 4
- Views: 529
RE: Runge Kutta Merson t1>t0 assert
<t>Hi, Jean-Philippe. Sorry for the delay -- it's grant-writing season here.<br/> <br/> The problem is that you are using the ConstantAngle constraint outside its usable range -- it cannot be used efficiently at angles very close to 0 or +/-180, and you have it set to -Pi. The reason is that this is...
- Fri Sep 18, 2009 10:53 am
- Forum: Simbody: SimTK multibody dynamics API
- Topic: Constraint Missing implementation
- Replies: 7
- Views: 1534
RE: Constraint Missing implementation
Since this is a new topic I'm moving it to a new thread entitled "Limiting joint motion" -- please see that thread for a response.
Sherm
Sherm
- Fri Sep 18, 2009 10:52 am
- Forum: Simbody: SimTK multibody dynamics API
- Topic: Limiting joint motion
- Replies: 1
- Views: 446
RE: Limiting joint motion
<t>Hi, Jean-Philippe.<br/> <br/> The best way to limit the motion of a joint is the way it's done in nature -- with forces! Think about how the limited motion is enforced physically and write a Custom Force that resists motion beyond the limit (I believe you can find Custom Force examples in the tut...
- Fri Sep 18, 2009 10:51 am
- Forum: Simbody: SimTK multibody dynamics API
- Topic: Limiting joint motion
- Replies: 1
- Views: 446
Limiting joint motion
<t>(Moved from another thread)<br/> BY: Jean-Philippe Jodoin (jpjodoin)<br/> DATE: 2009-09-18 09:54<br/> SUBJECT: RE: Constraint Missing implementation<br/> <br/> I was wondering, what would be the best to set a range to a mobilizer ? For example, I have a MobilizerBody::Ball that I only want to mov...
- Thu Sep 17, 2009 1:07 pm
- Forum: Simbody: SimTK multibody dynamics API
- Topic: Constraint Missing implementation
- Replies: 7
- Views: 1534
RE: Constraint Missing implementation
Hi, Jean-Philippe. It looks as though you mistakenly declared the variable Plane to be a "function of no arguments returning Halfspace" -- that is how I think the compiler will interpret the "()". That would explain the error message you got. Regards, Sherm
- Tue Sep 15, 2009 9:42 am
- Forum: Simbody: SimTK multibody dynamics API
- Topic: Constraint Missing implementation
- Replies: 7
- Views: 1534
RE: Constraint Missing implementation
<t>Hi, Jean-Philippe. <br/> <br/> Yes, you are right. Those specialized reaction force methods are more an expression of good intentions than actual code at the moment!<br/> <br/> None of the specialized reaction force methods for either mobilizers (MobilizedBody) or Constraints are implemented yet ...
- Wed Aug 19, 2009 4:18 pm
- Forum: OpenMM
- Topic: Run Example Files problem
- Replies: 5
- Views: 1101
RE: Run Example Files problem
<t>Hi, Akila. A few thoughts:<br/> - are you on Linux or Mac? Mac uses a different environment variable name for the library path.<br/> - I am confused about the specific error you're getting. Do you mean literally "-lOpenMM"? That string would appear at link time rather than run time.<br/> - Have y...
- Thu Aug 06, 2009 9:17 am
- Forum: SimTK Core Toolset
- Topic: Inverse dynamics
- Replies: 3
- Views: 545
RE: Inverse dynamics
<t>Thanks, Rob.<br/> <br/> The available inverse dynamics routines in 1.6 are methods of SimbodyMatterSubsystem that provide related operations. The main one is succinctly named calcResidualForceIgnoringConstraints(). That lets you apply forces and accelerations and returns the additional mobility f...